Inspired by the linked XKCD. Using 60% instead of 50% because that's an easy filter to apply on rottentomatoes.
I'll go first: I think "Sherlock Holmes: A game of Shadows" was awesome, from the plot to the characters ,and especially how they used screen-play to highlight how Sherlocks head works in these absurd ways.
It was a remake of sorts of It's a Mad, Mad, Mad, Mad World. Many of of the critics that hated it could have been doing so comparing it to the 1963 movie while the audience may have not cared and loved the update with contemporary comedic actors.
To many critics (who watch an insane number of movies) some tropes may seem overused or unoriginal.
Also holy crap, the original was nearly 3 hours long... Guess I'll have to check it out now. That one shows 71% critic and 83% audience scores.
As someone who hated the trailer back at release but enjoyed Rat Race later on DVD, I see both sides. If you're expecting a satire, it's not cohesive enough. It's full of many great gags, however, and might be more comparable to Dumb & Dumber. Personally I find the acting too good to resist and still watch it occasionally.
My brother is a huge Whoopi Golberg fan so we actually saw it opening weekend. Yes, it's derivative, but just too many bits of hilarity to not live it. And we constantly quote rowan Atkinson's line to each other. "Eetza Race!!" "I'm weeeeening!"